IBSNAT - The Development of Reliable Simulators of Complex Agronomic Systems

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IBSNAT - The Development of Reliable Simulators of Complex Agronomic Systems

During a period of approximately eleven years beginning in the early 80s the United States Agency for International Development (USAID) funded a multimillion-dollar network of agricultural and information scientists working in various parts of the world. Sparked initially by Univ. of Hawaii agronomists Goro Uehara and Gordon Tsuji, the aim of the project was nothing less than to improve the lot of limited resource farmers in the tropics and subtropics by compressing time. To accomplish this the project focused primarily on developing tools for systems analysis and simulation. The rationale was that armed with reliable simulators of the interaction between crops, soils and weather, farmers and policymakers could make informed decisions about the adoption of new technologies in new environments. Furthermore, this could be done without expending the decades normally required to introduce, test and disseminate such technologies through conventional methods. In the words of the project managers: "A typical scenario… may involve a comparison of a new variety with the one grown by the farmer, planted on the same day, on a sandy and clayey section of the farm, and supplied with 25 or 50 kilograms of nitrogen per hectare, once at planting and again at flowering. The outcome of this treatment combination would then be simulated for 50 different weather years to assess stability and productivity of the cropping system. An experiment that would nearly consume an agronomist's entire professional career could now be completed in a few minutes on a desktop computer."

Needless to say, the development of such "reliable simulators" of complex agronomic systems and the accompanying decision analysis tools would constitute a weighty undertaking, not to mention the obvious follow-up to ensure that "strong links between the biophysical outcomes and socioeconomic needs could later be forged." The resultant project came to be known as IBSNAT (International Benchmark Sites Network for Agrotechnology Transfer), and this book is in essence an overview of the project and its major technical products. Its title notwithstanding, this book is neither a handbook of agricultural management options, nor a review of agricultural decision making strategies. Rather, the book provides an overview of the simulation and analysis tools developed to support the making of decisions and recommendations. The title does, however, make sense when one understands that the ultimate objective of the project originators was to meet the need for farmers to have greater "access to options for improving their situation," and to "empower farmers and policy makers with a capacity to choose a better future for themselves and society.

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